The Event Horizon Focuser (EV) is a low-profile, friction-drive focuser designed for both the amateur and professional market.  The highly acclaimed Crayford design (see below) permits tolerances up to 100 times better than conventional rack-and-pinion focusers.  Zero image shift and zero backlash makes it fantastic for visual and photographic work and a  must for CCD imaging. 


         

Product Image Price+ Item Name

JMI Reverse Crayford 1¼" Focuser $129.00

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JMI Reverse Crayford 1¼" Focuser

JMI Reverse Crayford 1¼" Focuser For all RCF focusers you must specify whether you want a flat or curved base.  For curved bases, you need to specify the radius.  If you don't, you will get the standard size radius.  Please specify your...

JMI Reverse Crayford 2" Focuser $149.00

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JMI Reverse Crayford 2" Focuser

JMI Reverse Crayford 2" Focuser For all RCF focusers you must specify whether you want a flat or curved base.  For curved bases, you need to specify the radius.  If you don't, you will get the standard size radius. Place a note in the shopping...

JMI EV-3 Telescope Focuser (Cassegrain) $199.00

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JMI EV-3 Telescope Focuser (Cassegrain)

JMI EV-3 Telescope Focuser (Cassegrain) The Event Horizon EV-3 is a 2" black-anodized aluminum focuser with knurled knobs.  The focuser lifts up to 4 pounds.  Manual control is over 1½ times finer than most rack-and-pinion focusers. The...

JMI EV-3 Telescope Focuser (Newtonian) $209.00

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JMI EV-3 Telescope Focuser (Newtonian)

JMI EV-3 Telescope Focuser (Newtonian) The Event Horizon EV-3 is a 2" black-anodized aluminum focuser with knurled knobs.  The focuser lifts up to 4 pounds.  Manual control is over 1½ times finer than most rack-and-pinion focusers. The...

JMI EV-2 Telescope Focuser (Cassegrain) $259.00

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JMI EV-2 Telescope Focuser (Cassegrain)

JMI EV-2 Telescope Focuser  (Cassegrain) The Event Horizon EV-2 is a 2" black-anodized aluminum focuser with rubber grip knobs.  The focuser lifts up to 8 pounds.  Manual control is over 1½ times finer than most rack-and-pinion focusers. The...

JMI EV-2 Telescope Focuser (Newtonian) $269.00

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JMI EV-2 Telescope Focuser (Newtonian)

JMI EV-2 Telescope Focuser (Newtonian) The Event Horizon EV-2 is a 2" black-anodized aluminum focuser with rubber grip knobs.  The focuser lifts up to 8 pounds.  Manual control is over 1½ times finer than most rack-and-pinion focusers. The...

JMI EV-3 Telescope Focuser (Refractor) $269.00

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JMI EV-3 Telescope Focuser (Refractor)

JMI EV-3 Telescope Focuser (Refractor) The Event Horizon EV-3 is a 2" black-anodized aluminum focuser with knurled knobs.  The focuser lifts up to 4 pounds.  Manual control is over 1½ times finer than most rack-and-pinion focusers. The...

JMI Reverse Crayford 1¼" Focuser with Motor $274.00

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JMI Reverse Crayford 1¼" Focuser with Motor

JMI Reverse Crayford 1¼" Focuser with Motor For all RCF focusers you must specify whether you want a flat or curved base.  For curved bases, you need to specify the radius.  If you don't, you will get the standard size radius.  Please specify...

JMI Reverse Crayford 2" Focuser with Motor $296.00

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JMI Reverse Crayford 2" Focuser with Motor

JMI Reverse Crayford 2" Focuser with Motor A 1.25" Reverse Crayford focuser.  Motorized version include a standard hand unit.  For all RCF focusers you must specify whether you want a flat or curved base.  For curved bases, you need to...

JMI EV-2 Telescope Focuser (Refractor) $329.00

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JMI EV-2 Telescope Focuser (Refractor)

JMI EV-2 Telescope Focuser (Refractor) The Event Horizon EV-2 is a 2" black-anodized aluminum focuser with rubber grip knobs.  The focuser lifts up to 8 pounds.  Manual control is over 1½ times finer than most rack-and-pinion focusers. The...

JMI EV-1 Telescope Focuser (Cassegrain) $349.00

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JMI EV-1 Telescope Focuser (Cassegrain)

JMI EV-1 Telescope Focuser The Event Horizon EV-1 is a 2" black-anodized aluminum focuser with rubber grip knobs and two-speed operation.  The focuser lifts up to 8 pounds.  Dual-speed manual controls are over 15 times finer (small outer knob)...

JMI EV-1 Telescope Focuser (Newtonian) $359.00

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JMI EV-1 Telescope Focuser (Newtonian)

JMI EV-1 Telescope Focuser The Event Horizon EV-1 is a 2" black-anodized aluminum focuser with rubber grip knobs and two-speed operation.  The focuser lifts up to 8 pounds.  Dual-speed manual controls are over 15 times finer (small outer knob)...

JMI EV-3 Telescope Focuser (Cassegrain with motor) $359.00

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JMI EV-3 Telescope Focuser (Cassegrain with motor)

JMI EV-3 Telescope Focuser (Cassegrain with motor) The Event Horizon EV-3 is a 2" black-anodized aluminum focuser with knurled knobs.  The focuser lifts up to 4 pounds.  Manual control is over 1½ times finer than most rack-and-pinion focusers....

JMI EV-3 Telescope Focuser (Newtonian with motor) $369.00

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JMI EV-3 Telescope Focuser (Newtonian with motor)

JMI EV-3 Telescope Focuser (Newtonian with motor) The Event Horizon EV-3 is a 2" black-anodized aluminum focuser with knurled knobs.  The focuser lifts up to 4 pounds.  Manual control is over 1½ times finer than most rack-and-pinion focusers....

JMI EV-1 Telescope Focuser (Refractor) $419.00

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JMI EV-1 Telescope Focuser (Refractor)

JMI EV-1 Telescope Focuser  (Refractor) The Event Horizon EV-1 is a 2" black-anodized aluminum focuser with rubber grip knobs and two-speed operation.  The focuser lifts up to 8 pounds.  Dual-speed manual controls are over 15 times finer (small...

JMI EV-2 Telescope Focuser (Cassegrain with motor) $419.00

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JMI EV-2 Telescope Focuser (Cassegrain with motor)

JMI EV-2 Telescope Focuser (Cassegrain with motor) The Event Horizon EV-2 is a 2" black-anodized aluminum focuser with rubber grip knobs.  The focuser lifts up to 8 pounds.  Manual control is over 1½ times finer than most rack-and-pinion...

JMI EV-2 Telescope Focuser (Newtonian with motor) $429.00

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JMI EV-2 Telescope Focuser (Newtonian with motor)

JMI EV-2 Telescope Focuser (Newtonian with motor) The Event Horizon EV-2 is a 2" black-anodized aluminum focuser with rubber grip knobs.  The focuser lifts up to 8 pounds.  Manual control is over 1½ times finer than most rack-and-pinion...

JMI EV-3 Telescope Focuser (Refractor with motor) $429.00

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JMI EV-3 Telescope Focuser (Refractor with motor)

JMI EV-3 Telescope Focuser (Refractor with motor) The Event Horizon EV-3 is a 2" black-anodized aluminum focuser with knurled knobs.  The focuser lifts up to 4 pounds.  Manual control is over 1½ times finer than most rack-and-pinion focusers....

JMI EV-2 Telescope Focuser (Refractor with motor) $489.00

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JMI EV-2 Telescope Focuser (Refractor with motor)

JMI EV-2 Telescope Focuser (Refractor with motor) The Event Horizon EV-2 is a 2" black-anodized aluminum focuser with rubber grip knobs.  The focuser lifts up to 8 pounds.  Manual control is over 1½ times finer than most rack-and-pinion...

JMI EV-1 Telescope Focuser (Cassegrain with Motor) $509.00

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JMI EV-1 Telescope Focuser (Cassegrain with Motor)

JMI EV-1 Telescope Focuser (Cassegrain with Motor) The Event Horizon EV-1 is a 2" black-anodized aluminum focuser with rubber grip knobs and two-speed operation.  The focuser lifts up to 8 pounds.  Dual-speed manual controls are over 15 times...

JMI EV-1 Telescope Focuser (Newtonian with Motor) $519.00

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JMI EV-1 Telescope Focuser (Newtonian with Motor)

JMI EV-1 Telescope Focuser (Newtonian with Motor) The Event Horizon EV-1 is a 2" black-anodized aluminum focuser with rubber grip knobs and two-speed operation.  The focuser lifts up to 8 pounds.  Dual-speed manual controls are over 15 times...

JMI EV-1 Telescope Focuser (Refractor with motor) $579.00

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JMI EV-1 Telescope Focuser (Refractor with motor)

JMI EV-1 Telescope Focuser  (Refractor with motor) The Event Horizon EV-1 is a 2" black-anodized aluminum focuser with rubber grip knobs and two-speed operation.  The focuser lifts up to 8 pounds.  Dual-speed manual controls are over 15 times...


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